Control mechanism for auxiliary nozzles.



VV. A. DOBLE. v CONTROL MEOHANISM FOR AUXILIARY NOZZLES.

APPLIUATION FILED 11111112.1913.

l y l @3936@ Patented' Jan. 5, 1915.

2 BHEBTSSHBBT l.

W. A. DOBLE.

CONTROL MEGHANISM FOR AUXILIARY NOZZLBS.

APPLICATIONv FILEDJUNB 2, 1913,

WILLIAM e.. nonne, or smv rnaiversco, carrrtomtrn, assitance ro THE' lanzaronV WATER WHEEL COMPANY, or snit rreancisco, cmnromvrm a conronarron or CALIFORNIA.

Maaate.

@pecmcatibn of Letters Patent;

Patented dan., .5,.I215g Application' filed 3111162, 1913. vSerial No. 771,311'.

To all whom it may concern:

Be it known that I, WILLIAM A. DOBLE, a4 citizen of the United States, residing at San Francisco, county of San Francisco, and State of California, have invented certain new and useful Improvements in Control Mechanism for Auxiliar Nozzles, of which the following is a speci cation.

rIhis invention relates to control mechanism for Water wheels and relates more specically to means for controlling an. auxiliary discharge nozzle, and is an. im-

provement in the construction shown in' my prior application No. 343,732, filed November 1.6, 1906.

Many power. plantsl are so situated that it is frequently necessary todischarge acer.- tain minimum quantity of water regardless of the quantity of water that is required to drive the water wheels and develop. Sullicient power to meet the demands on the station.

In the control mechanism covered. by my prior application, abovereferred to, I employ a. main nozzle and valve therefor to supply the watertothe wheel, and an auxiliary nozzle and a valve therefor arranged to be opened and closed simultaneously with but in opposition to the movements of the main valve when the latter is moived sud-y denly by the governor, due to a change in the load on the wheel. The valves arey con,- nected together by means of suitable operating levers and. links and a. dash-pot is provided in one of the connections, the function of which is to permit the main valve to be moved gradually without moving the auxiliary valve and to cause .the auxiliary valve to move simultaneously with the main valve whenever the latter is shiftedsuddenly. By this construction, whenever the main valve is suddenly closed the auxiliary valve will beopenedbut. the pressure of the water on the lauxiliary valveI will xradually brin the latter to its seat and ereby cut o the discharge .through the auxiliary nozzle. The

above arrangement is thoroughly satisfactory where it is not necessary` todischarge a certain minimum quantity. ofwater regardless of. the uantity of. water required' by the wheel and. it has therefore been my' object in devising the present construction to so improve. the. construction shown in my prior application above referred to-.that-it will not, only be. suited to all installations-in which. the prior construction could beused, but is also 'adapted to be usedinlcases. where it is necessary to discharge a. certain. minimum quantity of water.

I have illustrated 'a practical! embodiment of my ings, in which, l

Figure 1 is a side elevation. of a mainand auxiliary nozzle. with the openatingconnections for the valves, the dash-pot. being shown in section. Fig. 2 is. abottom plan view of Fig.; 1, certain parts being shown; in section. Fig. 3 is a transverse section onnthe line4 3.*3 of Fig.. 2.

ReferringA to the. drawings, 10 indicates the main nozzle and 11 the auxiliary nozzle. The main nozzle is preferably provided ywith a needle valve 12 having a stern-13 which passes through a stuiiingbox 14 and a yoke 15 lsecured to the nozzle body; Suitable buffer springs i3 and 17 are arranged*on.-the` stem 13 on opposite sides of the yoke 15. The nozzle 11- is preferably provided with'- a needle valve 18, having a. stem 19 which. passes through av stung box.20. A yoke21 is'secured on the stem 19. and extends laterally on both sides thereof.. Brackets 22 and 23 are arranged on the side ofthestufling box 20 and have. secured thereto the rods 24 and 25 respectively. These rods carry suitable abutments26, between which and the yoke 21 springe 27 are arranged. By this construction the springs 27 will be compressed by opening the valve 18 and therefore the springsnormally tend to close the valve whenever the latter is open..

rlhe levers 28 and 29 are pivotally mounted at 30 on the yoke 15 or any other suitable support and have their upper ends connected with the valve stem. 13by means-oflinks' 31 and with the. arm 32 by meanshofl alink .33. The arm 32 is carried' by `a shaft 3.4:? which is mounted in suitable bearings 35,

supported in any suitablev manner. 'llhey shaft 3d isconnected with.` a governor. (not shown) which is arranged torock the-shaft in accordance. with, changes in speed of. the wheel. and. thereby.v shift the -main andi auxiliary valves. 'Ihe lower ends of the-levers218A head..

and 2.9 are. connected with the cross. pin 36 carried in the crosshead 37, towhoh:

is connected the piston rod 38, carrying the `operation of the dash-pot passes from one vtain minimum the nozzle 1l, it will be seen that the valve side of the piston to the other through the ports above mentioned. A yoke 47 is secured to the dash-pot cylinder 40 and provided with guide slots 48 for the guide shoes 49, carried by the cross head pin 36. A screw 50 is arranged in the outer end of the yoke 47 and provided with a hand-wheel 51 and a lock-nut 52. The inner end 53 of the screw 50 is arranged to engage a suitable abutment 54, preferably carried by the cross head 37.

The operation of the mechanism is as follows: Assuming that the valve 18 is closed and the valve 12 is open to a certain extent, any slight variations in the load on the wheel will be provided for by the governor gradually shifting the valve 12 to increase or diminish the quantity of water delivered to the wheel in accordance with the requirements. When the valve l2'is shifted slowly by the governor, the piston 39 of the dashpot will be moved in the dash-potcylinder, the oil passing from` one side of the piston to the other. If, however, the governor suddenly shifts the valve 12 toward the closed position, due to a sudden decrease in the load on the wheel, it will be seen that the piston 39 will be simultaneously moved toward the right (see Fig. 1). `Owing to the restricted size of the port 46, the oil will not pass quickly from one side of the piston to the other and therefore the valve 18 will be opened simultaneously with the closing movement of the valve 12. The pressure of the water behind the valve 18, however, and the tension in the springs 27 will gradually move the valve 18 to its seat. As the valve 18 moves toward its seat it will be seen that the end 530i' the screw 50 will approach the abutment 54 on the cross head 37 and if the adjustment of the screw 50 is such that the end 53 will engage the abutment 54 before the valve 18 reaches its seat the latter will be held open to a certain extent and a certain minimum quantity of water will be discharged through the nozzle 11. When the valve 12 is fully closed it will be seen that the valve 18 may be opened by means of the hand-wheel 51 and the screw 50. While this construction provides for discharging a cerquantity of water through 12 will be permitted to have its full range of movement so that the operation of the main valve will not be interfered with.

I am aware that various changes may be. made in the details of construction of the apparatus herein disclosed without departing from the spirit of my invention and l therefore claim such modifications as come within the scope of theappended claims Having thus described my invention, what I claim is:

1. In an apparatus of the class described, the combination of a main valve, an auxiliary valve, means connecting said valves together and adapted to cause them to move -simultaneously when the main valve is suddenly closed, and means for preventing the auxiliary valve from fully closing without limiting the normal range of movement of the main valve.

2. In an apparatus of the class described, the combination of a main valve, an auxiliary valve, means connecting said valves together and adapted to cause them to move simultaneously when the main valve is suddenly closed, and adjustable means for preventing the auxiliary valve from fully closing-without limiting the normal range of movement of the main valve.l

In an apparatus of the class described, the combination of a main valve, an auxiliary valve, means operatively connecting said valves together and including a dashpot having the cylinder thereof connected with one of said valves and the piston thereof connected with the other of said valves, and means for limiting the relative movement of said piston and cylinder.

4. In an apparatus of the class described, the combination of a main nozzle and valve therefor, an auxiliary nozzle and valve therefor, means operatively connecting said valves together and including a dash-pot having the cylinder thereof connected with one of said valves and the piston thereof connected with the other of said valves, and adjustable means for limiting the relative movement of said piston and cylinder.

5. In an apparatus of the class described, the combination of a main nozzle and valve therefor, an auxiliary nozzle and valve therefor, a pivotally mounted lever, means connecting one arm of said lever with said main valve, a movable member connected with said auxiliary valve, a member yieldably connected with said auxiliary valve adapted to be moved by said lever, and means for limiting the relative movement of said members.

6. In an apparatus of the class described, the combination of a main nozzle and valve therefor, an auxiliary nozzle and valve therefor. a dash-pot cylinder operatively connected with one of said valves, a piston in said cylinder and operatively connectedmaaeeo with the other of said valves, and an adjustable member coperating with said cylinder and piston to limit the relative movement thereof.

7. In an apparatus of the class described, the combination of a main nozzle and valve therefor, an auxiliary nozzle and valve therefor, a pivotally mounted lever, means connecting one arm of said lever with said main valve, a dash-pot cylinder connected with said auxiliary valve, a piston in said cylinder connected With said lever, and an adjustablernember carried by saidl cylinder and adapted to limit the movement of the piston therein.

8. In an apparatus of the class described, the combination of a main'nozzle and valve therefor, an auxiliary nozzle and valve therefor, a pivotally mounted lever, means connecting one arm of said lever With said main valve, a dash-pot cylinder connected With said auxiliary valve, a spring tending to close said auxiliary valve, a piston in said .lil

cylinder and connected with said lever, and

an adjustable screw adapted to limit the Vmovement of said piston in said cylinder.

9. In an apparatus of the class described,

the combination of a main nozzle and valve therefor, an auxiliary nozzle and valve therefor, a pivotally mounted lever,`means connecting one arm of said lever with said main valve, a dash-pot cylinder connected with said auxiliary valve, a spring tending` In testimony whereof I ailix my signature in presence of two Witnesses.

` A. DOBLE.

Witnesses:

ARTHUR L. BRYANT, JOHN M. Corr. 

